Lingual bar



Oct. 15, 1929. L. LELONG 1,732,021

LINGUAL BAR Filed April 192"! INVENTOR Z0zgaleh z 5 ATTORNEY Patented ct. 15, 1929 LOUIS LELONG, OF SOUTH ORANGE, NEW JERSEY nrneuar. nan

Application filed April 8,

The present invention relates to lingual bars employed in the art of dentistry and more particularly to the type of lingual bars having their end portions provided with def ormations for efiective bonding with the clental plate molded thereon.

In accordance with one feature of the present invention the deformations for obtaining the mechanical bonding effect between the bar and the composition of the dental plate may desirably be provided upon both the buccal and lingual sides of the end portions of the bar and in part are formed in configuration of readable characters as lettering.

is As a result thereof the deformations may be employed to function in obtaining'the mechanical bonding and in addition as a designation of the grade or source of manufacture of the bar while allowing the exposed or conneoting portion of the bar to have an un-- broken and smooth surface insuring comfort in use. Further valuable features of improvement have for their object to provide bonding ribs or projections in improved arrangement and spaced relation for obtaining an effective bonding effect to resist displacement of the plate longitudinally of and in transverse or rotative relation to the bar.

The aforesaid and other improved features to and advantages of my improved lingual bar structure will be more fully understood by reference to the accompanying drawing wherein like reference numerals are applied to the corresponding parts in the several views.

In the drawing:

Fig. 1 is a view in perspective of my improved lingual bar.

Fig. 2 is a plan view thereof with a portion shown in section.

Fig. 3 is a view in front elevation.

Fig. 4 is a partial side elevation of the end portion of the bar taken from the outer side thereof.

Fig. 5 is a similar View taken from the in ner side of the bar, and

Fig. 6 is a sectional view of the bar taken on line 66 of Fig. 5.

Referring to the drawings wherein there 5 is shown an approved embodiment of the fea- 1927. ,Serial no. 131,925.

tures' of my invention, 1 indicates the main 1 body portion of the bar which may desirably be of generally oval or flattened section having rounded edges to provide a smooth surface. The central portion of the body is bowed or arched as shown and the end portions 22, connected thereby, are formed as straight or tangent extensions thereof and are desirably of similar formation with suitable deformations for obtaining a mechanical bonding effect with the composition of the dental plate.

In accordance with the present invention, the end portions are of a generally flattened cross-section throughout their length and are provided on their outer or buccal sides with ribs or projctions 3-3 extending from each side of acentral and longitudinally extending rib 4:. The vertical or cross ribs 3 are arranged as shown whereby the alternate ribs are extended for the full distance between the upper and lower edges of the bar edges while the intermediate ribs are extended for but a portion of the distance from which it results that opposed rib surfaces or shoulders are 7 provided in greater and lesser spaced relation thereby to give an improved bonding or anchoring effect with the composition of the plate. The enlarged spacing between the outer portions of the longer cross ribs 3 is particularly effective in obtaining a strong bond by reason of the co-operation with the complemental shoulder of the plastic composition of relatively enlarged area and consequently of materially added strength and re sistance to shearing. The central and longitudinal rib t is desirable in affording strength to the structure in resisting vertical pressures.

Upon the opposite side of the end portion, the lingual side as shown, the deformations are provided by depressing of the metal thereby providing for theflow of metal to the op posite side to form the ribs 3 and 4; as de scribed. In the preferred manner of forming the depressions for bonding, they areas il-Bfi lustrated formed in theconfiguration of read able characters such as lettering whereby they may be further instrumental in identifying the bar as to grade, quality or source of man ufacture. The depressions of letter forma- 10 tion are indicated at 6 and are positioned within an enlarged depression 7 contained within the marginal, longitudinal shoulder portions 8 and the inner and outer shoulders 9 and 10. As will be understood, the enlarged and framed depression 7 provides for an elongated bonding with respect to the co-acting plastic composition thereby contributing materially to the strength of the bond produced.

The improved form and arrangement of the bonding deformations of the present invention, in addition to afi'ording identity of the bar, add materially to the strength of the bond by reason of the provision of enlarged spacing to provide for co-acting shoulders or projections of plastic material of substantialsize as compared to many of the bars as heretofore proposed and used wherein the metal ribs or projections of the bars are uniformlyof close spacing with the result of an inadequate bond by reason of the deficient cross-sections of the co-acting composition or relatively weaker material. 7

fwhile I have described and shown a preferred embodiment of the features of my invention, it will be understood that many modifications of form and arrangement may be made therein without departing from the scope ofthe invention as defined in the appended claims.

Having described my invention, I claim:

1. A lingual bar having end portions provided with deformations for mechanical bonding with the composition of the dental 1ections upon one side of the bar and depressions upon the opposite side of the bar having the configuration of readable characters and said depressions being positioned within an enlarged and longitudinally extending depresslon frame within a marginal rib portion,

substantially as described;

M I 2. A lingual bar having end portions relatively flattened and provided with deformations for mechanical bonding with the com position of the dental plate, said deformations comprising rib projections upon one side V of the bar consisting of a longitudinally extending rib and cross ribs laterally extending therefrom alternately for a greater and lesser distance and depressions on the opposite side of thebar positioned within an enlarged and longitudinally extended depression framed within a marginal rib portion, si'ibstantially as described;

tively flattened and provided with deformations for-mechanical bonding with the composition of the dental plate, said deformations comprising ribprojections upon one sideof the bar consisting of a longitudinally March, A. D. 1927.

' LOUIS LELONG.

' 3. VA lingual bar having end portions rela- 

